Attachment for lathes



Nov. 20 1923.

M. G. HUSTED ATTACHMENT FOR LATHES 2 Sheets-Sheet 1 Filed March 28. 19227 Nov. 20, 1923. 1,474,673 M. G. HUSTED v ATTACHMENT FOR LATHES FiledMarch 28. 1.922 2 Sheets-Sheet 2 Patented Nov. 20, 1923.

UNITED 1 er MONROE e. HUS'I'ED, or BnIneEroN, new JERSEY.

ATTACHMENT non narrrns,

Application filed March as, 1922. SeriaLNo. 547,487." 7

To all whom it may concern Be it known that I, Mormon G. Hus'rnmacitizen ofthe United States, anda resident of Bridgetom in the county ofCumberland and State of New Jersey, have invented certain new and usefulImprovements in an At,

tachment for Lathes, of which the following is a specification.

My invention'relates to an attachment for lathes andmore particularly toa control device for the cutting tooland carrier. I. V have illustratedthe invention as used in con-v nection with the type of lathe employinga rotary work carrier and a movable tool carrier in which the tool ismoved toward and from the work during the cutting operation.

The type of lathe illustrated herein is particularly adapted for-formingmoulds but it should be understood that my invention is equallyapplicable to other types of lathes as will be made more apparenthereinafter.

Generally speaking this inventionconten'lplates means for use inconnection with a tool carrier which is guided by a cam groove,

the cam groove functioning to displacethe tool carriertransverselycausing the same to In this, present instance where the workpiece isproperly fashion the work piece.

- a mould for bottles, the function-of the cam groove is to move thetool carrier so as to cause the same to properly shape the mould at thepoint which represents the point where the neck of the bottle mergesinto the body thereof.

Despite the fact that cam groove controls v have been heretofore foundto-loe the most efficient manner of guiding the cutting tool,

difficulty has been experienced in causing the tool to: properly cut thework piece when the face or the part to be cut wasab'rupt. This was duelargely to the fact that the bearing surface of the guide rollertravellingin the cam groove was struck on, a

different radius than the cutting face of the cutting tool, therebyrendering, impossible 'a synchronizing of the movement of the guideroller and the cutting edge of the tool.

I have found therefore that in order to efiiciently and correctly guidethe cutting .tool at the point ofthework piece representing "the neckofthe bottley'the guide roller or guide member working in the camgroove, must at this part of its travel, clear the confiningQedges ofthe cam groove and bear against relatively opposed edges of the itstravel therethrough. That is, in one caused to bear against thefedge. ofthe cam groove over which it may more easily slide c am groove at thispoint at least, duriixi gfll- Y direction the guiding member I must band on its return movement to lee-moved:

a shifting ofthe tool;carrier and a cone sequential engagement of theguiding memher with one of the other faces; of the, cam groove. 1

;One constructional example, of my invention isillustrated herein so asto, enable those skilled in this particular .art to ape;

preciate its advantages.

the drawings: Fig. 1 is a top plan view of the-lathe constructed inaccordance with my lnvention,

Fig. 2 is an enlarged fragmentary transverse sectlon taken on the planeindicated byline 2-2 in Fig. 1, .7 j Fig. 3 is a horizontal sectiontaken "on theplane indicated by line 3 3 of Fig. 22,;

certain parts being in elevation, and, A.

Fig. is a detail horizontal section of I the tool carrier. r Inthedrawings, the numeral 10 indi cates the bed of a lathe and ll arotatable work holder, which may be rotated by any suitable source ;ofpower (not shown).

Supported onjtfhe work holder is a work piece 12 which is here-shown asa bottle v mould, the work to be accomplished being that of fashioningthe interior of the work of a portion; 7

travelling carriage 13 is positioned uponlthe-lathe bed and adapted totravel longitu'dinallythereof to reciprocate the. cutting .100 tool.Mounted on the carriage 13'and adaptt ed to move transversely thereof isa cross 1 slide 1d. Rigidly secured to one end ofthe 5 cross slide 14"is an arm 15' formed with; a

slot 16 therein. This slotted arm 15 adapted; to adjustably' support. aguiding member 17, .here shown; as comprising an elongated tapered-body.Rigidly secured to V i f the bed of the lathe-is a support 18 which 1carries the adjustable cam groove '19. This camgroove. memberor templetis composed;

of two pair of rigid guide members and two sections'20 and formed ofaplural-ity of leaves whereby the guide groove at this point may beadjusted according to the; shape of the work piece: to be fashioned. Itshould be noted that while the guiding member 17 is movable throughthegreater part of the cam groove without any appreciable amount of playthat, at-the portion of the No. 1,401,702, grantedDecember 27th,1 921,

this resilient tool carrier comprises superimposed sections 24:connected by a central bolt 25. The uppersection isprovidedwithdepending lugs 26 which enter arcuate' recesses 27 formed in the; lowersection. Coil springs 28 are disposed in theserecessesand bear atthe'one end against thelugs 26 and at the other end against plates 29adjustable by means of set screws 30. The upper section 2% which carriesthe cutting-toolmay be rotated relatively to the lower section against'the tension of the springs 28, these springs however, acting to rotatethe upper section until the lugs 26 depending there from abut the endsofthearcuate recesses. The tension of the springs 28 may be regulated byadjusting the setscrews 30. In this manner, a constant pressure is puton the cutting tool so as to keep the same in engagement'with thew-orkthe upper section being rotated so as to dispose thecutting tool'at anangle prior to the timethat the cutting tool is inserted in a centralbore formed in the work piece and-as the work is cut the upper section2eof the cutting tool holder gradually assumes the position where the lugs26 abut the end of the arcuate slots.

For shiftingthe cross slide and conse quentlyv the cutting tool, theamount of the clearance of the guiding member 17 in the groove intheguiding templet,there is provided two pair of cooperating cams, one ofeach pair being-carried by the lower section of the cutting tool carrier21. These cams are numbered 3'1 and are pivotally mounted tothelowersection of the tool carrier 21 by means of pivot pins 32'."Each camcarries a pin-33 wor'king in a slot 34; formed in the tool carrier. Thispin and slot arrangement limitsthe movement of each cam 31.

Secured-to therbed lO of the lathe is a frame-35 provided with a pain ofsupports 36 whichadjustably support a pair of arms 37, the supports 36being caused to grip the arms 37 b'y-nieans of clamping, screws 38 .or"the like. Supported by the forward end of each awn-3'? is asle'e ve 39whichhouses a 'niovable plunger Or body 410 having a reduced end 521which carries a coil spring 42.

Lock nuts e13 provide a stop for the plunger 40 in one direction andalso permit an ad provided with an abrupt fiat/face a9 and a curved face50 while each cam 31 is provided with an abrupt flat face 51 and acurvedfaceJ52. r

The operation of the device, may be described as follows:'

Assuming that the tool carrier 21 is travelling in the direction of thearrowlA (see Figs. 1 and 3), the purpose-of the cams cam 45. Each iwould be toshift the cross slide and all the 1 parts carried thereby inthe direction of arrow B (see Fig. 1), sothat the edge of the guidingmember 1 7 will bear against the guide faceformed by the multi-plysector 20. This is accomplished by the pair of cams furthest away fromthe guiding meniher. As the carrier 21- ad'vances-the curved face 52, ofcam 31 engages curved face 50 of cam 45 and rides upwardly on this cam.This engagement of the cams shifts the cross slide and all the partscarried thereby in the direction of the arrow B and causes the guidingmember 17 to ride on the guiding face, formed by the multi-ply sector20. The tendency of the cams to displacethe' cross slide furtherthan-necessary is compensated for by the coil spring &2 which iscompressed by a longitudinal displacement of the plunger -10. It willbeseen that these two cams -must engage -with their curved faces becausethe pin 33 isat the end of the arcuate slot 44: formed in the carrier21.

Also that the shoulder 17 on the cam 45 is in engagement With the pin48.

()n the other'hand the flatfface 51 of the cam 31 of the other pair hasengaged the flat faces-9 of cam 45 andthereby rotating both cams to anidle position where they may clear one another. l

the tool carrier 21 reverses and travels in the direction opposite tothat ind-i'cate'd by the arrow A the cams will function in a ing member17 will operate to shift the cross slide 14 in a direction opposite tothat indicated by the arrow B thereby causing the guide member 17 toengage the guiding face formed bythemulti-plysector20 'At the same timethe other pair of cams have engaged with their flat surfaces,'but havecleared one another, this beingtheir idle movement.

Obviously, therefore, whenithetool carrier moves'toward' the work in thedirection reversed manner, the camsnearest the guid pass because thisface extends away from the guiding member17 in its direction of travel.The clearance provided for the guiding member 17 at this section of theguide groove permits the guide member 17 to easily clear the sector 20*.Obviously on the reverse movement of the carrier 21 the guidingmember 17is moved away from the sector 2O and against the sector 2O along whichit may easily slide. This movement affects the cutting tool in that itmoves the cutting edge 23 thereof away from the abrupt face on which itis cutting and causes the tool to make the out along the section of thework piece marked C on its return movement rather than on its forwardmovement into the work piece.

From theforegoing it w1ll be obvious that I have provided means formomentarily shifting the cutting tool guiding member whereby thisguiding member as well as the cutting tool may be easily passed over theabrupt faces thereby insuring the proper action of the cutting tool evenwhereacute cuts are to be made. This is of extreme importance in theparticular art described,

that is. bottle mould making and it will be immediately obvious that theinvention lends itself to use in other similar types of lathes.

\Vhile one illustrative example of my invention is illustrated herein, Ido not wish to be unnecessarily limited nor to be confined to thedetails of construction shown 2. In a device of the class described a atravelling cutting tool holder, a guidemem i ber therefor, a templet inwhichsaid guiding member travels and cooperating cams arrangedrespectively on said tool holder and in the path of said tool holderandengaging during the movement of said travelling tool holder forshifting said guiding member in said templet.

3.'In a device of theclass describeda travelling tool holder, a-guidingmember secured thereto, a templet through which said cent said toolholder, cooperating camsjc-arried by said tool holder andengageable-with said first mentioned cams during the travel of said toolholder wherebysaid guiding member will be shifted transversely; of saidtemplet during "the travel of said tool holder. i

4:. In a device of the classldescribed a travelling tool holder, a guidemember se- I cured thereto, a templet cooperating with said guide memberfor shifting said tool holder, a cam 'adj ustably positioned at each a Iside of said tool holder, cooperating cams carried by said. toolholder,a pair of said cams being brought into engagement during the movement ofsaid tool holder in both directions whereby sai-dguiding mem ber will beshifted against opposite faces of said templet.

5. In a device of travelling tool holder, a guiding member securedthereto, atemplet cooperating with said guide member for.laterally'displacing thetool holder, tofashion the work, said guidemember having a clearance in said templet at one portion thereof, camssup,-

ported adjacent both sides of said travelling" tool holder, resilientmeans, urging said the: class described a 1i I cams toward said toolholder, cooperating V cams carried by said tool holder, a pair. of saidcams being brought lnto engagement during the movement ofsaid toolholder in 7 either direction, whereby said guide mem, ber will be movedtransversely of said tem- 1 plet into engagement with one or the otherof the guide faces. r

Mormon HUSTED.

